CN105811907A - Audio processing method - Google Patents

Abstract

The invention provides an audio processing method. The method first receives the hearing information of the user about the frequency. The amplitude for the frequency of the sound signal is then increased to a maximum amplitude value. Then, the gains of a plurality of basic frequencies in the frequency are reduced, and the curve of the pull-down frequency and the corresponding amplitude gradually decreases to the original amplitude value before and after each basic frequency. And according to the hearing information, the gain of the hearing loss frequency in the frequency and the frequency of the front and back parts of the hearing loss frequency is improved, and the curve of the pull-up frequency and the corresponding amplitude gradually increases to a compensation amplitude value before and after the hearing loss frequency, so that the gain of the specific frequency is improved, and meanwhile, the occurrence of integral volume reduction is avoided.

Description

audio processing method

technical field

The invention relates to a signal processing technology, in particular to an audio processing method.

Background technique

With the development of technology, almost all processors mounted on consumer electronic devices today have the function of performing sound effect processing on sound signals. Currently, there are applications for integrating voice assistance functions into mobile electronic devices (such as smart phones) for hearing-impaired users. In this way, the user can clearly hear the surrounding sounds, thereby improving the convenience of life.

Due to long-term exposure to noisy environments or as people age, certain frequencies of hearing are depleted, so they cannot correctly identify the sound of certain frequencies when communicating with others. In response to the above situation, the volume (gain) of a specific frequency can be increased according to different individual hearing needs through the setting of the voice assistance function.

However, in practice, many current electronic devices using the Android system, in the process of increasing the volume of a specific frequency, the volume of other frequencies will be affected and reduced, which will cause the overall volume to drop as expected, making it impossible to play the sound. Auxiliary effect.

Contents of the invention

In view of this, the present invention provides an audio processing method that can increase the gain of a specific frequency while avoiding the decrease of the overall volume.

The audio processing method of the present invention is suitable for electronic devices. This method first receives the user's hearing information about the frequency. The amplitude for the frequency of the sound signal is then increased to a maximum amplitude value. Then reduce the gain of multiple fundamental frequencies in the frequency, so as to pull down the curve of the frequency and its corresponding amplitude before and after each fundamental frequency and gradually decrease to the original amplitude value. And according to the hearing information, increase the gain of the hearing loss frequency and the part of the frequency before and after the hearing loss frequency in the frequency, and pull up the curve of the frequency and its corresponding amplitude before and after the hearing loss frequency to gradually increase to the compensation amplitude value.

Based on the above, the audio processing method of the present invention performs related steps such as increasing the overall amplitude (volume) and reducing the gain of the fundamental frequency before increasing the gain of a specific frequency. In this way, it is possible to prevent the overall volume from dropping when the gain of a specific frequency is increased, and the effect of sound assistance can be smoothly exerted.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

Fig. 1 is a block diagram of an audio processing device shown in an embodiment of the present invention;

Fig. 2 is a flowchart of an audio processing method shown in an embodiment of the present invention;

Fig. 3 is a schematic diagram of an example of a user's hearing test shown in an embodiment of the present invention;

4A to 4C are exemplary schematic diagrams of an audio processing method shown in an embodiment of the present invention;

Fig. 5 is a flowchart of an audio processing method shown in an embodiment of the present invention;

FIG. 6 is a schematic diagram of an example of an audio processing method according to an embodiment of the present invention.

Explanation of reference signs:

10: Audio processing device;

11: Sound receiving unit;

12: Sound playback unit;

13: processing unit;

32: Diagram of hearing;

34: Hearing curve;

42_1～42_3, 62: schematic diagram of amplitude;

44_1～44_3, 64: Curve;

A: Amplitude;

Acom: compensation amplitude value;

Amax: maximum amplitude value;

As: original amplitude value;

F: frequency;

Fb1～Fb6: base frequency;

Fc: hearing loss frequency;

Fm1～Fm5: intermediate frequency;

HS: hearing strength;

S202-S208, S502-S512: each step of the audio processing method.

detailed description

FIG. 1 is a block diagram of an audio processing device according to an embodiment of the present invention. Please refer to FIG. 1 , the audio processing device 10 of this embodiment is, for example, a smart phone, a personal digital assistant (PDA for short), a personal digital assistant mobile phone or a tablet computer and other computer devices. The audio processing device 10 adopts Android system, for example. The audio processing device 10 includes a sound receiving unit 11 , a sound playing unit 12 and a processing unit 13 , the functions of which are described as follows.

The sound receiving unit 11 can be any type of sound receiving element/circuit. For example, the sound receiving unit 11 may be a microphone to receive sound from the surrounding environment or a specific sound source.

The sound playing unit 12 may be any type of sound playing element/circuit. For example, the sound playing unit 12 may be a loudspeaker, a loudspeaker or an audio device to play sound signals.

The processing unit 13 is, for example, a single-core or multi-core central processing unit (Central Processing Unit, CPU for short), or other programmable general purpose or special purpose microprocessor (Microprocessor) or signal processor (Signal Processor). The processing unit 13 is respectively coupled to the sound receiving unit 11 and the sound playing unit 12, and can perform appropriate frequency compensation on the sound signal received by the sound receiving unit 11 according to the hearing needs of the user, and perform the frequency compensation through the sound playing unit 12. Play to implement audio processing functions. The following examples illustrate the detailed steps of the audio processing method applicable to the audio processing device 10 of the present invention.

Fig. 2 is a flowchart of an audio processing method shown in an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2 at the same time. The audio processing method of this embodiment is applicable to the audio processing device 10 of FIG. .

In step S202, the processing unit 13 may receive the user's hearing information about the frequency. For example, FIG. 3 is a schematic diagram of an example of a user's hearing test shown in an embodiment of the present invention. Referring to FIG. 3 , a hearing diagram 32 as hearing information can be generated by performing a hearing test on the frequency of the sound signal to the user. The vertical axis of the hearing diagram 32 is the hearing strength HS of the user, and the horizontal axis is the frequency F of the sound signal. In FIG. 3 , the hearing curve 34 can represent the user's hearing strength HS at each frequency. As shown in FIG. 3 , the user has the lowest hearing strength HS at the hearing loss frequency Fc. Therefore, after the processing unit 13 receives the hearing information, the processing unit 13 can obtain the compensation gain required by the user at each frequency according to the hearing strength HS of each frequency on the hearing diagram 32, and judge the user's desired compensation gain at each frequency accordingly. The hearing loss frequency Fc with the largest gain needs to be compensated.

Next, in step S204, the processing unit 13 may increase the amplitude for the frequency of the sound signal to a maximum amplitude value Amax. For example, FIGS. 4A-4C are exemplary schematic diagrams of an audio processing method shown in an embodiment of the present invention. In FIGS. 4A-4C , the amplitude diagrams 42_1-42_3 have the amplitude A of the sound signal on the vertical axis, and the frequency F of the sound signal on the horizontal axis, and respectively show the frequency of the sound signal and the corresponding amplitude curves 44_1-44_3. As shown in Figure 4A, the processing unit 13 can increase the curve 44_1 of the frequency and its corresponding amplitude from the original amplitude value As to the maximum amplitude value Amax by adjusting the gain and related parameters of the sound signal at each frequency, that is, the sound signal at each frequency The amplitude of the frequency increases up to a maximum amplitude value Amax. Wherein, the maximum amplitude value Amax is, for example, the maximum volume amplitude at which the sound signal can not be distorted, and can be, for example, 400 mV. The original amplitude value As can be, for example, the output amplitude of 150 mV of a general earphone, but the present invention is not limited thereto.

Next, in step S206, the processing unit 13 can reduce the gain of multiple fundamental frequencies (such as fundamental frequencies Fb1-Fb6) in the frequency, so as to pull down the curve of the frequency and its corresponding amplitude (such as the curve 44_2 in FIG. 4B ) before and after each fundamental frequency Decrease gradually to the original amplitude value As. For example, as shown in FIG. 4B , the processing unit 13 can adjust the quality factor (Qfactor) and gain of the sound signal at each fundamental frequency Fb1-Fb6, so that the frequency response of the sound signal conforms to the curve 44_2 so that each fundamental frequency Fb1-Fb6 The amplitude before and after Fb6 gradually decreases to the original amplitude value As, and makes the curve 44_2 approach the original curve before processing (the amplitude is the original amplitude value As). The basic frequencies Fb1 - Fb6 may be, for example, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz and 8000 Hz respectively, but the present invention is not limited thereto.

Moreover, in step S208, the processing unit 13 may increase the gain of the hearing loss frequency Fc and the frequencies before and after the hearing loss frequency Fc in the frequency according to the received hearing information, so as to pull up the curve of the frequency and its corresponding amplitude (for example, the curve in FIG. 4C ). The curve 44_3) gradually increases to the compensation amplitude value Acom before and after the hearing loss frequency Fc. As shown in FIG. 4C, the processing unit 13 can adjust the quality factor and gain of the sound signal at the hearing loss frequency Fc and the frequencies before and after the hearing loss according to the received hearing information, so that the frequency response of the sound signal conforms to the curve 44_3 to reduce the hearing loss. The amplitude before and after the frequency Fc gradually increases to the compensation amplitude value Acom. Accordingly, the processing unit 13 can compensate the sound signal received by the sound receiving unit 11 for the hearing loss frequency Fc of the individual user, and play it through the sound playing unit 12 to meet the hearing needs of the individual user and play the sound. Auxiliary effect.

Fig. 5 is a flowchart of an audio processing method shown in an embodiment of the present invention. Please refer to FIG. 1 and FIG. 5 at the same time. The audio processing method of this embodiment is applicable to the audio processing device 10 in FIG. .

In step S502, the processing unit 13 may receive the user's hearing information about the frequency. In step S504, the processing unit 13 may increase the amplitude for the frequency of the sound signal to a maximum amplitude value Amax. In step S506, the processing unit 13 may reduce the gains of multiple fundamental frequencies (such as fundamental frequencies Fb1-Fb6) in the frequency, so as to gradually reduce the curve of the pulled-down frequency and its corresponding amplitude to the original amplitude value As before and after each fundamental frequency. The steps S502 , S504 , and S506 are the same or similar to the steps S202 , S204 , and S206 in the foregoing embodiments, so details thereof will not be repeated here.

Different from the foregoing embodiments, in this embodiment, in step S508, the processing unit 13 may further reduce the gains of the intermediate frequencies (such as intermediate frequencies Fm1-Fm5) between the fundamental frequencies, so as to pull down the curve of the frequency and its corresponding amplitude It gradually decreases to the original amplitude value As before and after each intermediate frequency. For example, FIG. 6 is a schematic diagram of an example of an audio processing method according to an embodiment of the present invention. In FIG. 6 , the vertical axis of the amplitude diagram 62 is the amplitude A of the sound signal, the horizontal axis is the frequency F of the sound signal, and shows a curve 64 of the frequency of the sound signal and its corresponding amplitude. As shown in FIG. 6 , the processing unit 13 can adjust the quality factor and gain of the sound signal at each intermediate frequency Fm1-Fm5, so that the frequency response of the sound signal conforms to the curve 64 so that each fundamental frequency Fb1-Fb6 and each intermediate frequency Fm1-Fm5 The amplitude before and after Fm5 gradually decreases to the original amplitude value As, and makes the curve 64 closer to the original curve in which the amplitude maintains the original amplitude value As. It should be noted that although this embodiment uses one intermediate frequency between the fundamental frequencies for illustration, in one embodiment, more intermediate frequencies can be used between the fundamental frequencies to adjust the amplitude curve. The number of intermediate frequencies is not limited.

Next, in step S510 , the processing unit 13 may calculate the compensation gains of each intermediate frequency (eg, intermediate frequencies Fm1 - Fm5 ) through an algorithm according to the compensation gains of each base frequency (eg, base frequencies Fb1 - Fb6 ). Moreover, in step S510, the processing unit 13 can adjust the quality factor and gain of each fundamental frequency and each intermediate frequency according to the respective compensation gains of the fundamental frequency and the intermediate frequency, so that the curve of the pull-up frequency and its corresponding amplitude gradually increases before and after the hearing loss frequency to the compensation amplitude value Acom. Accordingly, the processing unit 13 can compensate the sound signal received by the sound receiving unit 11 for the hearing loss frequency Fc of the individual user, and play it through the sound playing unit 12 to meet the hearing needs of the individual user and play the sound. Auxiliary effect.

In summary, the audio processing method of the present invention first increases the overall amplitude (volume) of the signal, then reduces the gain of related frequencies such as the fundamental frequency by adjusting the quality parameter (Qfactor) and gain of each frequency, and then improves the specific frequency based on this. frequency gain. In this way, it is possible to prevent the overall volume from dropping when the gain of a specific frequency is increased, and the effect of sound assistance can be smoothly exerted.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (5)

1. an audio-frequency processing method, it is adaptable to electronic installation, it is characterised in that the method comprises the following steps:

Receive user and listen force information about multiple frequencies；

The amplitude of those frequencies for acoustical signal is increased to peak swing value；

Reduce the gain of base frequency in described frequency, before and after each described base frequency, be decremented to original amplitude value with the curve of the drop-down corresponding amplitude of described frequency gradually；And

Listening force information according to this, improve audition consume frequency and this audition in described frequency and consume the gain of frequency front and rear part frequency, the curve to pull up the corresponding amplitude of described frequency is incremented to compensation amplitude gradually before and after this audition consume frequency.

2. audio-frequency processing method according to claim 1, it is characterised in that this listens force information to include this user compensating gain needed for each described frequency, and after this user of described reception listens the step of force information about this of described frequency, also include:

Force information is listened, it is judged that this audition consume frequency that this user this compensating gain in described frequency is maximum according to this.

3. audio-frequency processing method according to claim 1, it is characterised in that in the described frequency of described reduction after the gain of base frequency, also include:

Reduce the gain of at least one intermediate frequency between each described base frequency, before and after each described intermediate frequency, be decremented to this original amplitude value gradually with the curve of the drop-down corresponding amplitude of described frequency.

4. audio-frequency processing method according to claim 3, it is characterized in that, in the described frequency of described raising, this audition consume frequency and this audition consume the gain of frequency front and rear part frequency, and the curve to pull up the corresponding amplitude of described frequency consumes, in this audition, the step being incremented to this compensation amplitude before and after frequency gradually and includes:

This compensating gain of each described intermediate frequency is calculated according to this compensating gain of each described base frequency；And

Adjust quality factor and the gain of each described base frequency and each described intermediate frequency according to this compensating gain respective, the curve to pull up the corresponding amplitude of described frequency is incremented to this compensation amplitude gradually before and after this audition consume frequency.

5. audio-frequency processing method according to claim 1, it is characterised in that described base frequency includes 250 hertz, 500 hertz, 1000 hertz, 2000 hertz, 4000 hertz and 8000 hertz.